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Route Reliability

Philadelphia → St. Louis

PHL–STL · 814 miles · Philadelphia International Airport to St. Louis Lambert International Airport

78
Usually Fine
WanderNerd Reliability Score
77%
Arrive within 15 minutes
10 min
Average arrival delay
1.5%
Cancelled
1,576
Flights in the data

Data through May 2026.

Who flies it best

Ranked by on-time arrivals. Historical results, not predictions.

  1. 1.Southwest Airlines79%724 flights
  2. 2.American Airlines75%852 flights

What the data says

Morning flights do better here.

PHL–STL flights departing between 6–9 AM arrived on time 90% of the time, versus 65% between 6–9 PM.

Thursday is the weak spot.

PHL–STL flights arrived on time 82% of the time on Wednesdays. On Thursdays: 70%.

Southwest Airlines has a slight edge here.

Southwest Airlines arrived on time 79% of the time on this route; American Airlines managed 75%.

Flights on this route

The breakdown

On-time by weekday
  • Mon73%(238 flights)
  • Tue81%(214 flights)
  • Wed82%(216 flights)
  • Thu70%(236 flights)
  • Fri77%(237 flights)
  • Sat79%(165 flights)
  • Sun75%(245 flights)
On-time by departure window
  • 6–9 AM90%(339 flights)
  • 9 AM–12 PM84%(293 flights)
  • 12–3 PM80%(180 flights)
  • 3–6 PM65%(208 flights)
  • 6–9 PM65%(460 flights)
  • 9 PM–12 AM80%(71 flights)
On-time trend by month
81%
May

Jun 62% → May 81% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202562%130
July 202564%132
August 202573%142
September 202582%132
October 202583%147
November 202580%161
December 202565%148
January 202681%97
February 202691%77
March 202677%113
April 202687%128
May 202681%144

Keep nerding

Based on 1,576 historical flights, because apparently we checked. Historical flight data: U.S. Bureau of Transportation Statistics, June 2025 – May 2026. Data through May 2026. How we calculate this.